Synthesis, characterization, and heterogeneous catalytic implementation of sulfated alumina nanoparticles. arene hydrogenation and olefin polymerization properties of supported organozirconium complexes

Linda A. Williams, Tobin J Marks

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26 Citations (Scopus)

Abstract

Sulfated alumina nanoparticles (n-AlS) have been prepared as a high-surface-area support/activator for organozirconium catalysts. The large external surface area allows chemisorption of ca. 3 times more organozirconium catalyst per square nanometer than previously possible on bulk sulfated alumina. It is found that Cp*ZrMe2/n-AlS (Cp* = η5-(CH3)5C5, Me = CH 3) and ZrBz3/n-AlS (Bz = CH2C6H 5) are active catalysts for arene hydrogenation as well as for olefin polymerizations. The less sterically encumbered ZrBz3/n-AlS exhibits higher polymerization activity and a greater arene hydrogenation turnover frequency than the slightly more encumbered Cp*ZrMe2/n-AlS. Catalyst ZrBz3/n-AlS also displays a larger tolerance for sterically demanding hydrogenation substrates as well as increased 1-hexene incorporation in ethylene/1-hexene copolymerizations.

Original languageEnglish
Pages (from-to)238-245
Number of pages8
JournalACS Catalysis
Volume1
Issue number4
DOIs
Publication statusPublished - Apr 1 2011

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Aluminum Oxide
Alkenes
Olefins
Hydrogenation
Alumina
Polymerization
Nanoparticles
Catalysts
Chemisorption
Catalyst supports
Copolymerization
Ethylene
Thermodynamic properties
Substrates
1-hexene

ASJC Scopus subject areas

  • Catalysis

Cite this

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abstract = "Sulfated alumina nanoparticles (n-AlS) have been prepared as a high-surface-area support/activator for organozirconium catalysts. The large external surface area allows chemisorption of ca. 3 times more organozirconium catalyst per square nanometer than previously possible on bulk sulfated alumina. It is found that Cp*ZrMe2/n-AlS (Cp* = η5-(CH3)5C5, Me = CH 3) and ZrBz3/n-AlS (Bz = CH2C6H 5) are active catalysts for arene hydrogenation as well as for olefin polymerizations. The less sterically encumbered ZrBz3/n-AlS exhibits higher polymerization activity and a greater arene hydrogenation turnover frequency than the slightly more encumbered Cp*ZrMe2/n-AlS. Catalyst ZrBz3/n-AlS also displays a larger tolerance for sterically demanding hydrogenation substrates as well as increased 1-hexene incorporation in ethylene/1-hexene copolymerizations.",
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N2 - Sulfated alumina nanoparticles (n-AlS) have been prepared as a high-surface-area support/activator for organozirconium catalysts. The large external surface area allows chemisorption of ca. 3 times more organozirconium catalyst per square nanometer than previously possible on bulk sulfated alumina. It is found that Cp*ZrMe2/n-AlS (Cp* = η5-(CH3)5C5, Me = CH 3) and ZrBz3/n-AlS (Bz = CH2C6H 5) are active catalysts for arene hydrogenation as well as for olefin polymerizations. The less sterically encumbered ZrBz3/n-AlS exhibits higher polymerization activity and a greater arene hydrogenation turnover frequency than the slightly more encumbered Cp*ZrMe2/n-AlS. Catalyst ZrBz3/n-AlS also displays a larger tolerance for sterically demanding hydrogenation substrates as well as increased 1-hexene incorporation in ethylene/1-hexene copolymerizations.

AB - Sulfated alumina nanoparticles (n-AlS) have been prepared as a high-surface-area support/activator for organozirconium catalysts. The large external surface area allows chemisorption of ca. 3 times more organozirconium catalyst per square nanometer than previously possible on bulk sulfated alumina. It is found that Cp*ZrMe2/n-AlS (Cp* = η5-(CH3)5C5, Me = CH 3) and ZrBz3/n-AlS (Bz = CH2C6H 5) are active catalysts for arene hydrogenation as well as for olefin polymerizations. The less sterically encumbered ZrBz3/n-AlS exhibits higher polymerization activity and a greater arene hydrogenation turnover frequency than the slightly more encumbered Cp*ZrMe2/n-AlS. Catalyst ZrBz3/n-AlS also displays a larger tolerance for sterically demanding hydrogenation substrates as well as increased 1-hexene incorporation in ethylene/1-hexene copolymerizations.

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